congratulations. you're down with crestor. yes! when diet and exercise aren't enough, adding crestor lowers bad cholesterol up to 55%. crestor is not for people with liver disease or women who are nursing, pregnant, or may become pregnant. tell your doctor all medicines you take. call your doctor if you have muscle pain or weakness, feel unusually tired have loss of appetite, upper belly pain, dark urine or yellowing of skin or eyes. these could be signs of serious side effects.